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v3.23.3

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Business Information [Line Items] |  |  |
Cash and cash equivalents | $ 3,873.6 | $ 2,540.5 |
Advertising expense | 64.7 | 41.7 | $ 36.1
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 1.4 | 2.9 |
Variable Interest Entity, Consolidated, Notes Payable | $ 118.8 | 64.3 |
Forestar Group [Member] |  |  |
Business Information [Line Items] |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 63.00% |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 37.00% |  |
Subsidiaries [Member] |  |  |
Business Information [Line Items] |  |  |
Cash and cash equivalents | $ 70.2 | 64.4 |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Business Information [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 1,600.0 | 1,500.0 |
Accounts Receivable [Member] |  |  |
Business Information [Line Items] |  |  |
Cash and cash equivalents | $ 301.8 | $ 494.8 |

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